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以NMMO/水/纤维素溶液作为原料,采用反相悬浮分散技术,制备出球形纤维素珠体。以纤维素珠体粒径在38～150μm所占比重为标准,通过单因素实验确定了溶液中纤维素的最佳含量为6%、最佳连续相为聚丙二醇2000(PPG2000)、最佳表面活性剂为吐温80;通过正交实验优化了分散剂的用量、搅拌速度、连续相与非连续相的体积比、反应温度和反应时间等影响因素,最终确定这些影响因素的最佳值分别为2.5%、400 r/min、V(连续相):V(非连续相)=4:1、105℃、2h。通过测定,该珠体的晶型为纤维素Ⅱ,结晶度为58.37%,比表面积为577.10m~2,平均孔径为28nm,孔容为4.18mL/g,耐压极限为1.0MPa左右。
Using NMMO / water / cellulose solution as raw material, spherical cellulose beads were prepared by reversed-phase suspension dispersion technique. The optimum content of cellulose in solution was 6%, and the best continuous phase was polypropylene glycol 2000 (PPG2000). The best surface The optimum dosage of dispersant, stirring speed, volume ratio of continuous phase to non-continuous phase, reaction temperature and reaction time were optimized by orthogonal experiments. The optimal values of these influencing factors were determined respectively 2.5%, 400 r / min, V (continuous phase): V (discontinuous phase) = 4: 1, 105 ° C, 2h. Through the determination, the crystal form of this bead is cellulose Ⅱ, the crystallinity is 58.37%, the specific surface area is 577.10m ~ 2, the average pore diameter is 28nm, the pore volume is 4.18mL / g and the pressure limit is about 1.0MPa.